Gang-saw mill



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Nb. 380.236. Patented Mar. 27, 1888.

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UNITED STATES PATENT OFFICE;

WILLIAM M. WILKIN, "OF ERIE, PENNSYLVANIA.

GANG-'SAWv MILL.

SPECIFICATION forming part. of Letters Patent No. 380.236, dated March 27, 1888.

Application medocaberis, 1887. seria1No.25-2,194. (No model.)

.To all whom it may concern:

Beit known that I, WILLIAM M. WILKIN, a citizen of the United States, residing at Erie, in the county of Erie and State of Pennsylvania, have invented certain new and useful In1- provements in Gang-Saw Mills; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enablev others skilled in the art to which it appertains to make and use the same.

This invention relates to gang saw mills; and it consists in certain improvements in the construction and operation thereof, as will1 be hereinafter fully set forth, and pointed out in the claims. x

My linvention is` illustrated in the accompanying drawings, as follows:

Figure 1 is a front elevation of a gangsaw Y mill with my improvements thereon, onlyso much of the mill being shown as is necessary to fully illustrate .the application of my improvement. Fig. 2 is avertical section-on the line x win Fig. 1, the parts beingdrawn on a larger scale, and only such parts being shown as are necessary to illustrate myimprovement. Fig. 3 is a view like that in Fig. 1, on an einlarged scale, showing only such parts as are necessary to illustrate my invention and showing an alternative construction.

Specifically speaking, my improvements relate to means for moving the saw-frame, and in no way relate to the general construction of the mill, but are applicable to mills of various construction,as to framework,feed-rol1ers,&c. Only such of the various parts of the mill will be referred to as are necessary to explain the relation of such parts as are new.

A marks the frame-work of the mill, and B the saw sash or frame; D, the crank-shaft; D and DZD?, the cranks on said shaft, and D? the balance-wheels.

In all gang-saw mills with which l am acquainted the power is either applied to drive t-he crank-shaft, and from it the saw-sash is driven., or else the power is applied directly to the saw-frame, and from it the crank-shaft is driven by proper connecting rods. In the latter instance the crank-shaft is merely used to operate proper balancewheels and operate the valve-gear. Heretofore in every instance, so far as Iam aware, swinging con.

meeting-rods are used between the crank-shaft and the saw-sash. One of the objects of my constructions is to avoid the use of such connecting-rods, because in the rapid movement of the mill the rapid vib'ratory movement of the connecting-rods, as the crank revolves, generates a lateral vibration in the y framework, and, further, because they give to the saw-frame a lateral thrust, rston one side, then on the other, causing considerable friction on its guides. provide at the lower part of the frame a steamengine cylinder, (marked G yin Figs-l and 2, andv G in Fig. 3,) and the piston stem from this cylinder (or one of them where there are two stems, as shown in Figs. l and 2) extends To accomplish this result, Iv

up and takes hold of the saw-frame B at b. A,

This stem is marked C in the drawings. In this stem G, at the point where it takes hold of the middle crank, D,of the crank-shaft, there is provided a yoke with a horizontal slotopening, and in this slot the journal-boxes of the wristf couplings, which engage the wristpin of that crank, are secured and slide horizontally as the crank-shaft revolves.

The reciprocating action of the piston ofthe steam-,cylinder reciprocates the saw-frame by direct action, and it generates a' rotary action of the crank-shaft by reason of the slot or yoke in the stem." The only lateral throw there is is that of the cranks and the journal-boxes, and, as theera'nks of the crank-shaft will be properlybalanced, this will produce no lateral vibration perceptible.

In the construction shown in all the figures p I provide for balancing the saw-frame by a reciprocating counter-balance E. In the construction shown in Figs. 1 and 2A the steam-v cylinder has two pistons which move in opposite directions, Fig. 1 showing them in* ex treme separation, and Fig.*2 in extreme apf proximation. These pistons are marked H and H', the former being connected with the stem C, and the latter with a stem, Fwhich extends from the lower end of the piston and connects directly with the weight E. Rods r E E', having yokesE2 E, are connected with the weight E and cranks DZDQ, and are guided in guides at e e e2. These rods have only a vertical movement and no lateral movement IOO whatever. They serve to transmit to the crank-shaft and thence to the saw-frame the power exerted by the steam upon the piston H. The weight of these rods, the weight E, the stem F, and piston H will be proportioned so as to be equal to the weight ofthe saw-sash, the stem C, and piston H, or substantially so.

As before stated, it will be seen there is no lateral movement of the parts except 4 the cranks, and there is no lateral thrust by the connecting parts upon the frame, and hence lateral vibration and friction are avoided.

In the construction shown in Fig. 3 the steam-cylinder G has but one piston and piston-stem, and this takes hold of the saw-frame, and the counter-weight E is moved by the crank-shaft. In this figure the weight is shown as guided in guides I; but this is not material, for it may be guided by guides on the rods E', as in Fig. 1.

What I claim as new is 1. Ina gang-saw mill, the combination, substantially as set forth, of a reciprocating sawframe, a steam-engine cylinder having a reciprocating piston, a stem or rod connecting said piston directly with said frame, a horizontal slot or yoke in said rod or stem, a journal-box sliding in said yoke or frame, and a crank-V shaft having one of its crank-pins embraced by said sliding box.

2. In a gang-saw mill, the combination, substantially as set forth, of a reciprocating sawframe and a reciprocating counter-balance, a. steam-engine cylinder having a reciprocating piston, a rod or stem connecting said piston directly with said saw-frame, ahorizontal slot or yoke in said rod or stem, which receives the journal-box of a crankpiu, and a crankshaft having three cranks, the middle one of which stands opposite the other two and has its pin journaled in said journal-box, and rods connecting the other two cranks with the said counter-weight.

3. In a gangsaw mill, the combination, substantially as set forth, of a reciprocating sawframe, a reciprocating counter-weight,a steamengine cylinder having a reciprocating pistou, a crank-shaft having three cranks, as shown, a rod or stem connecting said piston directly with said frame, a horizontal yoke or slot in said rod or stem, which receives the journalbox of the middle crank of said crank-shaft, and two vertically-guided rods which connect with said counter-weight and are provided with yokes or slots, the same as said pistonstem, which receive the journal-boxes 0f the outer cranks of said crank-shaft.

4. In a gang-saw mill, the combination, substantially as set forth, of a reciprocating sawframe, a reciprocating counter-weight, a steamengine cylinder having two pistons which reciprocate in opposite directions, a rod or stem connecting one of said pistons with the said counter-weight, and a rod or stern which connects the other of said pistons with the said saw-frame, a crank-shaft having three cranks, the middle one of which is opposite the other two, a slot or yoke in the pistonstem, which connects with the saw-frame and embraces the journal-box of the middle crank, and two ver- 

